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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8af18fc997fed50910d36c1d20632a319bdcf89aa480538d41d82a4207a766c' 
  AND token = 'kW6+cjJ4b7MgdALtymQG8OYhltyLLo+5+leiDtfv0ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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