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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4493932f22716af7eb185f5893aa910bbd69844626d857b7e24d20e4a29202' 
  AND token = 'ynrFRpngXe2YNwVZ7Oxe8+PRWBl+2UWE9CB2716P/dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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