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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd14366a6a122b2534a8d510c9a84bcfc9dd035e84a6e9b7e984fe24e11216d6f' 
  AND token = '991ohyScyzacRG72eopQ9O8Ifs2uPN+Lc98yc20pXUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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