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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab68985e3df389887dcc9101158eb0ccb9623e0a4dbaf376bd062349237dbbb3' 
  AND token = 'g0NFGzyRs1C6JWyv+aWLdV8b0pGCorjJWFQj0/9yxK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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