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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983e728d4a86f3812e792df67cced4a64346943fe349608ff3b58e843830b160' 
  AND token = 'FwGsRk4jHRaQBdCDOI0V0lw3IV9NoQoBad90xSW66jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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