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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f01a702ee14f757cb3ff4d52ac3fc926e4cee9a6d398ce3cf54564a7df3dd71' 
  AND token = 'DGnHeFAgAKjnV/Oo1xRao4ygCEXNLvUwGfw7jReAbI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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