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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea7788f08d45f1d602c2a2cb6474b8eba145e81ebb0a898be1da132fa1f4eb04' 
  AND token = 'GeuUuxMPZ9+Yn59DqoMXJtINw+EWSDImWl9q1JgMcF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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