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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e56be20bdf8a24054084a812bfc0b6109d3e3b9ca593a4895112ecbb1e45ac1a' 
  AND token = '5X7oOz/d00LqLAiNEeotMj+GPlZPFxS+nTClhJOXnKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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