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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbec760a09d837f0efe7c4e3bf78d2fa5a1b1dd788a65eaa4b240186f1a6e9b2' 
  AND token = 'SR5rY2kDK3UCDSeNnAhqOiDX7VhpymYxhQ5KUEIwAGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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