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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0e389e553d02f736bafaf362e681c939de3732332e3efcb94a4b3019318c5de' 
  AND token = 'hSf5gA48oaBMQf2G4Dux+jaGX6hAwKiSAlBfnzsk89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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