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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0644d74b1d59c8830cb85b9341f01403a605c88e44ed946f9344ade1d9955de5' 
  AND token = 'VG0OyH4FKAMkalEOYCwU5K+lUKfIGnhSSnUVW4wOXxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}