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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fe1399b1e65a957e5d9fb833786dc2e6d1a99cc2caf5182bff54416fa20d83c' 
  AND token = 'y6C+HepXfsZn1UX69+UKRggDrDT4aNJDnX5p1GGqeWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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