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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6acaddfcc1556fc6e0c8d29b4361728e550d6f05e02dba38b87179cb1755f6b5' 
  AND token = 'zIsf9nGejl+cUZQvfP2uLNv0dEHPNEGbut8VvRiX5vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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