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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a215a1ce138444eb16f316c1e49223ce244193a28ab3133e8162ac33ec56c5' 
  AND token = 'QYcDZxXA0uqxcInILn2NprDBg1okxub2ksmnEAJUoHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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