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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6f51b0eece2d05d3aee64c8538ff803dd65da41263f320d7e5c854e6affd3ae' 
  AND token = 'ePuA5g+61azvugLMMV/iPHkvREwbbj8mBKMEVIZGNTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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