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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ada3c6a5488a9605cb38033caaf4e552fad4162720cb035c40aa7ca7b3623b9' 
  AND token = 'fmm/c3EUhMxNDpCkdV/hsQqNyZpZLlD/BD3oG5rCEJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00610

JSON explain

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