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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dfeae839bc8380591c41ecb1519a4ecc5acf9d36e1612b10850616895e12cbd' 
  AND token = 'oTO69dxzRYRV7xGYuewWl/OFdwaMcSm/rnWDwRd8TIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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