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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb636a23e7006d169da3f5fb8644cf6270fb660b6d02b3c0a425ca54d578219e' 
  AND token = 'Galj0y+IkOR1ujp97HPI7Np7QFfrJ2xNv8gk7Vt8FOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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