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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7d8a20846b157d5ff99d1d13a0c5b504de96628fc4557c4b514bf1d0e9cf69' 
  AND token = 'kqj2HdPNbnE5ZOXc4jFpLhfBnC1rtoVhY70ev2USsSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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