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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3f94927eb53dbca9659583131f7a9cc8e8a5677f659cb58c4dada634c60c64a' 
  AND token = 'ieI6dkEUiQJmMYm6dA992e+IAyNZVHNvt3RhOwasTvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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