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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a153a3b8adc26276fcd7f256d87d6dda56cb3035398df87f954dd9cb7298715' 
  AND token = 'S4C3kf0aCOvvjRvkVSzqUFKnOeT3u3EIBtLliy+3nus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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