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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb43e1043fb1a4dda67759beb16e44c264c02e8411491be02e2860bdbd2680f4' 
  AND token = 'urlc4I5IshH4wLlRJsdPU2ssptx7aJ+qOyTRKkK96+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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