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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd7e13f5d8beb6b0b60cf471e2df816df507f02fe147135a66f85c686ab673cd' 
  AND token = 'hYvHECEN1K02ICtIfaxUBtef4cWl3/Fpyp0vp3wV8ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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