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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e16fd2f7150e66a5a9b6a2ad8a5bd59d1707fe50dc4b1d4ff2c3a1b98c0e3e2' 
  AND token = 'aiu9GToQOqa4TBAADtBGqwbpeYhtmgaIM2Z5tgOI8Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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