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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a97b16b0e019afbb047fa5daabccd7712190e7e25eb54fab4ab89cc1d14c0d22' 
  AND token = 'RA8IP6kS+bCIDi+9/NH5zTbrYWR+EtvzJuHZMRCoVrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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