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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a41d4b2bcf45fefee4d680d8998509812fa3b06c309d64f3ec98e435ba724cb9' 
  AND token = '+QaO/076B7L9FmYV1aLjQdIW8uec4U0A2BOUAjmQlU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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