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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b1808a39a8aed5358daca8d89cece0dee9d4187155abda669e37d36f3f6379d' 
  AND token = 'wN0Ko3k/pFugelGExB+fl9YrzltZl5sSW2Y3mF+2vt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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