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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03eb8649f36982ffb0842dbc2c015d95d56687e89dbc018a7d1ff41be4fa07a2' 
  AND token = 'ZUQYLtdAl49nNVaFcOPvLG6kPSd+0tLiwPZ0on5/TSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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