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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c0542dee25c74b204d342b0a707e17ee0acc094b8af13590d75bd4d4667d8aa' 
  AND token = 'jeJ+HimEfmWheSA49AWYOMztJJtMKBskYF7q7BV9fNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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