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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93a25d438384a98dfd2fdefce1548dc95e9b29f1154d4b565f70bed17d57f5fc' 
  AND token = '7UFkm8NbaK2ZyHXfDZ12VkDgAsg3+dXP09dWbVySX0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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