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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bfd5b77c700492c20dca9d3a59621e9bc7355e35f2362f6b6f78d4904b8a07f' 
  AND token = 'mP4RXXLLPuGnr6XlxfV4ymrr2YmNnhfrgWtWOGbvqto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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