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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e36c35e5fde8bcb2992c2641ef238b30eddb0846b201e4c4cc8ff3ae34a71b66' 
  AND token = 'QBGGXFIVIf5eivDpXEJ8HCteUz7F5ToMbLr6L+CFkhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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