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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f55d7710be57e08de90bd4d8ec903c5ae89bd12a2725b7274c73b555d966a12' 
  AND token = 'sSHJ3zqdmLYS8pyu9ZXLNVXhi/CQN9fP9zSbtALnSDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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