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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2b6a14931af83544a08a21bc3f27d5944a1922d6282422c95d966c16c2dd862' 
  AND token = 'pqcoarIA9u2u0qwMkVj+DhLFT+4LfHsLuuHuyJHv7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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