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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f18b5d85a665827a791dd5c7aade91eff2f845c78e772dc9933388620aea3fac' 
  AND token = 'EbqEYEwV6N8q2XfG8leviFoO8QE4EHKYIka4x0K+knM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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