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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2c02c2a66431eb92baeda9a7a147b524e387e541ea88399b4c3098f2e8ab29e' 
  AND token = 'U2aU5+sh6AqzDUNimcDJBoZQrecFx4frVhZD4YAqdmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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