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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d12de94e36ae4a6dafd41d8aa8c2d19f5ad74d40b1301d892dd21f4c19fe4ef' 
  AND token = 'rXZAnV4vIpdg4NMNotGhzQG9pgg5tbEUtWpcg8bt2bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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