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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3899ce948bbbb0b9ec601ee1538a54b50eebaf7c54b4c1298f0afa1d3e0f035b' 
  AND token = 'a2UIJZs9HRCsWbilZKIhEqNt5waUj7fajeD8V0VlDAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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