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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dca10e73ea19d4e7bf75ef461b92dc59adc5d30a6fe085d2f3cf2100d3d79f89' 
  AND token = 'ycbeaLa2TRyYMr3pxjIpVBOo+IP1mqckwHbMpIfjEJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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