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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '901f71f6465b5e0800d618320d721d5718387dd69584d08b04c8b914d7278487' 
  AND token = 'xolV7K80HYa9zHhpde7+4nJbn4i2M6OVYHiqsww6dFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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