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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e561d94b354f8fc06b6ad2a680137c626a30e63203fab5ad22636739c2238c29' 
  AND token = 'TlKlgdWrboylbcaXT2sfxrsSnQulUQUObsLkGxznylQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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