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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cefbe778b721d4ceb2bcd237628aaa9b2b79f2b5185d5898bd159cb75ce864c2' 
  AND token = 'zIVl978Y0C6sp7FOXyT26qSLI0eXI2QBMPZ9ckt+/lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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